linux-kernel - Re: [PATCH] drivers/thermal/tegra: fix a doule free devce node

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Message-ID: <5B727D30.1050007@huawei.com>
Date:   Tue, 14 Aug 2018 14:56:48 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
CC:     <ezequiel@...labora.com>, <rui.zhang@...el.com>,
        <edubezval@...il.com>, <jonathanh@...dia.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/thermal/tegra: fix a doule free devce node

On 2018/8/14 14:39, Daniel Lezcano wrote:
> On 09/08/2018 15:40, zhong jiang wrote:
>> Device node iterators will get the return node. Meawhile, It is
>> also put the previous device node. An explicit put will cause
>> a double put.
> What about:
>
> Subject: drivers/thermal/tegra: Fix a double free on the device node
>
> "The function 'for_each_child_of_node' iterates over the node list by
> dropping the of_node reference of the previous node.
>
> Calling of_node_put() on the iterator is pointless and leads to an
> inconsistent refcounting in addition to a double free. Remove it."
 Thank you for doing this. I am sorry for stupid issue.

 Sincerely,
 zhong jiang
>> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
>> ---
>>  drivers/thermal/tegra/soctherm.c | 1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
>> index ed28110..3aa55c9 100644
>> --- a/drivers/thermal/tegra/soctherm.c
>> +++ b/drivers/thermal/tegra/soctherm.c
>> @@ -980,7 +980,6 @@ static void soctherm_init_hw_throt_cdev(struct platform_device *pdev)
>>  		tcd = thermal_of_cooling_device_register(np_stcc,
>>  							 (char *)name, ts,
>>  							 &throt_cooling_ops);
>> -		of_node_put(np_stcc);
>>  		if (IS_ERR_OR_NULL(tcd)) {
>>  			dev_err(dev,
>>  				"throttle-cfg: %s: failed to register cooling device\n",
>>
>